PHP curl 发送 json 格式数据

$data = array("name" => "Hagrid", "age" => "36");$data_string = json_encode($data);$ch = curl_init('http://api.local/rest/users');curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");curl_setopt($ch, CURLOPT_POSTFIELDS,$data_string);curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);curl_setopt($ch, CURLOPT_HTTPHEADER, array(    'Content-Type: application/json',    'Content-Length: ' . strlen($data_string))); $result = curl_exec($ch);